package cn.tedu.sp06.filter;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

/**
 * @ClassName AccessFilter
 * @Description:类描述
 * @Author Tedu
 * @Date 2021/6/23 16:38
 * @Version V1.0
 **/
@Component
public class AccessFilter extends ZuulFilter {
//设置过滤器的类型:pre routing post error
    @Override
    public String filterType() {
        return FilterConstants.PRE_TYPE;
    }
//位置序号
    @Override
    public int filterOrder() {
        return 6;
    }
//判断针对当前请求是否执行过滤代码
    @Override
    public boolean shouldFilter() {
        /*调用商品判断权限
        * 调用商品和订单,不检查权限*/
        //获得调用的服务id
        RequestContext ctx = RequestContext.getCurrentContext();
        String serviceId = (String) ctx.get(FilterConstants.SERVICE_ID_KEY);


        return "item-service".equals(serviceId);
    }
//过滤代码
    @Override
    public Object run() throws ZuulException {
        //获取Request对象
        RequestContext ctx = RequestContext.getCurrentContext();
        HttpServletRequest request = ctx.getRequest();
        //接收token参数
        String token = request.getParameter("token");
        //如果没有token,阻止继续访问,直接返回响应
//        if (token==null||token.length()==0||token.trim().length()==0)
        if (StringUtils.isBlank(token)){
            //阻止继续访问
            ctx.setSendZuulResponse(false);
            //直接返回响应
            ctx.addZuulResponseHeader("Content-Type","text/html;charset=UTF-8");
            ctx.setResponseBody("Not Login!未登录!");

        }
        //这个返回值不起任何作用,返回任何数据都可以
        return null;
    }
}
